The Earth–Mars link, day by day

Kepler mean-element orbits (the same model as qll/space/ephemeris.py, ported line by line and checked to 10⁻¹⁵), solar-conjunction blackout at a Sun–Earth–Mars angle below the threshold, optional relays at Sun–Earth L4/L5, and the demonstrated memories that would outlive today's round trip. Drag the date or press play.